I am looking for small edc light with AA/14500, small enough to be concealed in my fist (ideally 9cm length and 2cm diameter). Since my bad experience getting assaulted when walking home at night, I am looking one with basic tactical feature :

Overall i don’t think a light will help much in this situation. Our laws seem to be on the criminals side its sad.

Yeah mate. Even when our home is broken into, we are to comply.

Well I cannot see myself physically fit for a fight. It’s just for random opportunistic attack. My purpose for the flashlight is just to buy few seconds for escape. My main self defense tool is my running shoes.

Check the 2018 version Klarus XT1A.
1000 lumens, instant access to turbo and low/strobe depending on the mode you choose.
A bit out of your budget, but you can probably find it for $32-33 with a coupon.